Denso 3165 Spark Plug

Denso 3165 U-Groove Spark Plug

Denso 3165 is a conventional spark plug built for direct-fit secondary ignition service across a wide range of import applications. Its U-Groove ground electrode design helps improve ignitability for more consistent combustion and engine efficiency, while the copper core and nickel electrode materials support dependable everyday operation.

Key Features

• U-Groove ground electrode tip design for improved spark exposure
• Conventional spark plug construction for OE-style replacement service
• 5000 ohm resistance for radio noise suppression
• Copper center electrode core for stable heat transfer
• Nickel center and ground electrode tip materials
• 0.8 pre-gap size, 14.0 mm thread diameter, 19.0 mm reach
• Flat seat design with 16.0 mm hex size
• Manufacturer heat range 22

Product Details

The Denso U-Groove Conventional line is engineered for drivers who want a straightforward spark plug replacement with a focus on ignition quality and consistent engine operation. Part number 3165 uses a single-ground-electrode layout, standard ground configuration, and a U-Groove tip profile to help the spark kernel form more efficiently. This makes it a practical choice for routine maintenance on vehicles such as Audi A4, Audi Q5, Volkswagen GTI, and Honda Civic applications listed in the fitment data. This part cross-references DENSO Auto Parts (e.g., K22PR-U) for the same application.

Common Issues This Part Can Address

• Hard starting caused by worn spark plug electrodes
• Rough idle from inconsistent ignition performance
• Misfire symptoms related to aged secondary ignition components
• Reduced fuel efficiency from weak spark delivery
• Loss of throttle response from degraded plug condition

Installation Notes and Tips

Verify thread diameter, reach, seat type, and heat range before installation. Denso 3165 uses a flat seat, 14.0 mm thread diameter, 19.0 mm reach, and 16.0 mm hex size, so matching the engine specification is important for proper sealing and combustion chamber fit. Check the pre-gap against the vehicle service specification before installation, and inspect ignition coils, wires, and boots for wear when replacing spark plugs on Audi A4, Volkswagen Tiguan, or Honda Civic models.

Quality Assurance

Denso is a recognized OE supplier in ignition components, and the U-Groove Conventional design reflects that focus on precise fit and stable spark performance. Part number 3165 is built to meet the dimensional and electrical requirements listed above for the confirmed applications.

Compatible Vehicles

• Fits 2010-2016 Audi A4, N/A
• Fits 2010-2016 Audi A4 Quattro, N/A
• Fits 2010-2016 Audi A5 Quattro, N/A
• Fits 2013-2016 Audi allroad, N/A
• Fits 2015-2016 Audi Q3, N/A
• Fits 2015-2016 Audi Q3 Quattro, N/A
• Fits 2011-2016 Audi Q5, N/A
• Fits 2009-2016 Volkswagen CC, N/A
• Fits 2009-2016 Volkswagen Eos, N/A
• Fits 2009-2016 Volkswagen Tiguan, N/A
• Fits 2012-2015 Audi A6, N/A
• Fits 2013-2015 Audi A6 Quattro, N/A
• Fits 2011-2015 Audi TT Quattro, N/A
• Fits 2010-2014 Audi A5, N/A
• Fits 2011-2014 Volkswagen GTI, N/A
• Fits 2011-2013 Audi A3, N/A
• Fits 2008 Audi A3, N/A
• Fits 2011-2013 Audi A3 Quattro, N/A
• Fits 2012-2013 Volkswagen Beetle, N/A
• Fits 2013 Volkswagen Golf, N/A
• Fits 2012-2013 Volkswagen Jetta, N/A
• Fits 2009-2010 Volkswagen Passat, N/A
• Fits 2009 Audi TT, N/A
• Fits 2003-2005 Honda Civic, N/A
• Fits 1998 Honda Civic, N/A
• Fits 1993-1995 Hyundai Scoupe, N/A
• Fits 1991 Audi 200 Quattro, N/A